Chicago police have released a sketch of a suspect who they say robbed and sexually assaulted a woman in the Greater Grand Crossing neighborhood last month.

The 28-year-old victim was walking east on 79th Street between South Michigan and Wabash avenues at about 4:40 a.m. on April 24 when a man approached her from behind and forced her into an alley, police said.

The man took out a knife and dragged the victim to the rear of the 7800-block of South Michigan Avenue where he robbed and sexually assaulted the victim, police said.

The suspect is described by police as a Black man, between 20 to 25 years old, 5'7" to 5'9" and approximately 130 pounds with brown eyes and was wearing dark clothing.

Anyone with information is asked to contact Area South Detectives at (312) 747-8271.